1bdad60633
There are several reasons why this is undesirable:
1. It never happens during normal operation anyway
2. If it does happen it causes performance to be very, very poor
3. It isn't likely to solve the original problem (memory shortage
on remote DLM node) it was supposed to solve
4. It uses a bunch of arbitrary constants which are unlikely to be
correct for any particular situation and for which the tuning seems
to be a black art.
5. In an N node cluster, only 1/N of the dropped locked will actually
contribute to solving the problem on average.
So all in all we are better off without it. This also makes merging
the lock_dlm module into GFS2 a bit easier.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
170 lines
4.4 KiB
C
170 lines
4.4 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef LOCK_DLM_DOT_H
|
|
#define LOCK_DLM_DOT_H
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/list.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/wait.h>
|
|
#include <net/sock.h>
|
|
|
|
#include <linux/dlm.h>
|
|
#include <linux/dlm_plock.h>
|
|
#include <linux/lm_interface.h>
|
|
|
|
/*
|
|
* Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
|
|
* prefix of lock_dlm_ gets awkward. Externally, GFS refers to this module
|
|
* as "lock_dlm".
|
|
*/
|
|
|
|
#define GDLM_STRNAME_BYTES 24
|
|
#define GDLM_LVB_SIZE 32
|
|
#define GDLM_DROP_COUNT 0
|
|
#define GDLM_DROP_PERIOD 60
|
|
#define GDLM_NAME_LEN 128
|
|
|
|
/* GFS uses 12 bytes to identify a resource (32 bit type + 64 bit number).
|
|
We sprintf these numbers into a 24 byte string of hex values to make them
|
|
human-readable (to make debugging simpler.) */
|
|
|
|
struct gdlm_strname {
|
|
unsigned char name[GDLM_STRNAME_BYTES];
|
|
unsigned short namelen;
|
|
};
|
|
|
|
enum {
|
|
DFL_BLOCK_LOCKS = 0,
|
|
DFL_SPECTATOR = 1,
|
|
DFL_WITHDRAW = 2,
|
|
};
|
|
|
|
struct gdlm_ls {
|
|
u32 id;
|
|
int jid;
|
|
int first;
|
|
int first_done;
|
|
unsigned long flags;
|
|
struct kobject kobj;
|
|
char clustername[GDLM_NAME_LEN];
|
|
char fsname[GDLM_NAME_LEN];
|
|
int fsflags;
|
|
dlm_lockspace_t *dlm_lockspace;
|
|
lm_callback_t fscb;
|
|
struct gfs2_sbd *sdp;
|
|
int recover_jid;
|
|
int recover_jid_done;
|
|
int recover_jid_status;
|
|
spinlock_t async_lock;
|
|
struct list_head delayed;
|
|
struct list_head submit;
|
|
struct list_head all_locks;
|
|
u32 all_locks_count;
|
|
wait_queue_head_t wait_control;
|
|
struct task_struct *thread;
|
|
wait_queue_head_t thread_wait;
|
|
};
|
|
|
|
enum {
|
|
LFL_NOBLOCK = 0,
|
|
LFL_NOCACHE = 1,
|
|
LFL_DLM_UNLOCK = 2,
|
|
LFL_DLM_CANCEL = 3,
|
|
LFL_SYNC_LVB = 4,
|
|
LFL_FORCE_PROMOTE = 5,
|
|
LFL_REREQUEST = 6,
|
|
LFL_ACTIVE = 7,
|
|
LFL_INLOCK = 8,
|
|
LFL_CANCEL = 9,
|
|
LFL_NOBAST = 10,
|
|
LFL_HEADQUE = 11,
|
|
LFL_UNLOCK_DELETE = 12,
|
|
LFL_AST_WAIT = 13,
|
|
};
|
|
|
|
struct gdlm_lock {
|
|
struct gdlm_ls *ls;
|
|
struct lm_lockname lockname;
|
|
struct gdlm_strname strname;
|
|
char *lvb;
|
|
struct dlm_lksb lksb;
|
|
|
|
s16 cur;
|
|
s16 req;
|
|
s16 prev_req;
|
|
u32 lkf; /* dlm flags DLM_LKF_ */
|
|
unsigned long flags; /* lock_dlm flags LFL_ */
|
|
|
|
struct list_head delay_list; /* delayed */
|
|
struct list_head all_list; /* all locks for the fs */
|
|
struct gdlm_lock *hold_null; /* NL lock for hold_lvb */
|
|
};
|
|
|
|
#define gdlm_assert(assertion, fmt, args...) \
|
|
do { \
|
|
if (unlikely(!(assertion))) { \
|
|
printk(KERN_EMERG "lock_dlm: fatal assertion failed \"%s\"\n" \
|
|
"lock_dlm: " fmt "\n", \
|
|
#assertion, ##args); \
|
|
BUG(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define log_print(lev, fmt, arg...) printk(lev "lock_dlm: " fmt "\n" , ## arg)
|
|
#define log_info(fmt, arg...) log_print(KERN_INFO , fmt , ## arg)
|
|
#define log_error(fmt, arg...) log_print(KERN_ERR , fmt , ## arg)
|
|
#ifdef LOCK_DLM_LOG_DEBUG
|
|
#define log_debug(fmt, arg...) log_print(KERN_DEBUG , fmt , ## arg)
|
|
#else
|
|
#define log_debug(fmt, arg...)
|
|
#endif
|
|
|
|
/* sysfs.c */
|
|
|
|
int gdlm_sysfs_init(void);
|
|
void gdlm_sysfs_exit(void);
|
|
int gdlm_kobject_setup(struct gdlm_ls *, struct kobject *);
|
|
void gdlm_kobject_release(struct gdlm_ls *);
|
|
|
|
/* thread.c */
|
|
|
|
int gdlm_init_threads(struct gdlm_ls *);
|
|
void gdlm_release_threads(struct gdlm_ls *);
|
|
|
|
/* lock.c */
|
|
|
|
void gdlm_submit_delayed(struct gdlm_ls *);
|
|
int gdlm_release_all_locks(struct gdlm_ls *);
|
|
unsigned int gdlm_do_lock(struct gdlm_lock *);
|
|
|
|
int gdlm_get_lock(void *, struct lm_lockname *, void **);
|
|
void gdlm_put_lock(void *);
|
|
unsigned int gdlm_lock(void *, unsigned int, unsigned int, unsigned int);
|
|
unsigned int gdlm_unlock(void *, unsigned int);
|
|
void gdlm_cancel(void *);
|
|
int gdlm_hold_lvb(void *, char **);
|
|
void gdlm_unhold_lvb(void *, char *);
|
|
|
|
/* mount.c */
|
|
|
|
extern const struct lm_lockops gdlm_ops;
|
|
|
|
#endif
|
|
|